Hydromechanical impact of basement rock on injection-induced seismicity in Illinois Basin.

ABSTRACT: The common explanation of observed injection-induced microseismicity is based on the measured stress state at the injection interval and the assumption that it remains the same in the vicinity. We argue here that representing the stress state in different geologic formations over the injection site with the single Mohr's circle is insufficient due to local stratigraphic features and contrast in compressibilities of the involved formations. The role of hydromechanical coupling in the microseismic response is also crucial for the proper assessment of the problem. Thoroughly monitored Illinois Basin Decatur Project revealed the majority of CO₂ injection-associated microseismic events being originated in the crystalline basement. Even though basement faults can serve as the conduits

SUBMITTER: Bondarenko N 

PROVIDER: S-EPMC9485228 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature